drm/i915: Move the dpll_hw_state clearing to intel_dpll_crtc_compute_clock()

All .crtc_compute_clock() implementations do the same memset() to
clear the dpll_hw_state (since we preserve it across
intel_crtc_prepare_cleared_state()). Move the memset() to the common
wrapper.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220325123205.22140-7-ville.syrjala@linux.intel.comReviewed-by: Jani Nikula <jani.nikula@intel.com>

drivers/gpu/drm/i915/display/intel_dpll.c

@@ -1081,9 +1081,6 @@ static int ilk_crtc_compute_clock(struct intel_atomic_state *state,
 	int refclk = 120000;
 	int ret;
 
-	memset(&crtc_state->dpll_hw_state, 0,
-	       sizeof(crtc_state->dpll_hw_state));
-
 	/* CPU eDP is the only output that doesn't need a PCH PLL of its own. */
 	if (!crtc_state->has_pch_encoder)
 		return 0;
@@ -1177,9 +1174,6 @@ static int chv_crtc_compute_clock(struct intel_atomic_state *state,
 	const struct intel_limit *limit = &intel_limits_chv;
 	int refclk = 100000;
 
-	memset(&crtc_state->dpll_hw_state, 0,
-	       sizeof(crtc_state->dpll_hw_state));
-
 	if (!crtc_state->clock_set &&
 	    !chv_find_best_dpll(limit, crtc_state, crtc_state->port_clock,
 				refclk, NULL, &crtc_state->dpll)) {
@@ -1201,9 +1195,6 @@ static int vlv_crtc_compute_clock(struct intel_atomic_state *state,
 	const struct intel_limit *limit = &intel_limits_vlv;
 	int refclk = 100000;
 
-	memset(&crtc_state->dpll_hw_state, 0,
-	       sizeof(crtc_state->dpll_hw_state));
-
 	if (!crtc_state->clock_set &&
 	    !vlv_find_best_dpll(limit, crtc_state, crtc_state->port_clock,
 				refclk, NULL, &crtc_state->dpll)) {
@@ -1225,9 +1216,6 @@ static int g4x_crtc_compute_clock(struct intel_atomic_state *state,
 	const struct intel_limit *limit;
 	int refclk = 96000;
 
-	memset(&crtc_state->dpll_hw_state, 0,
-	       sizeof(crtc_state->dpll_hw_state));
-
 	if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_LVDS)) {
 		if (intel_panel_use_ssc(dev_priv)) {
 			refclk = dev_priv->vbt.lvds_ssc_freq;
@@ -1273,9 +1261,6 @@ static int pnv_crtc_compute_clock(struct intel_atomic_state *state,
 	const struct intel_limit *limit;
 	int refclk = 96000;
 
-	memset(&crtc_state->dpll_hw_state, 0,
-	       sizeof(crtc_state->dpll_hw_state));
-
 	if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_LVDS)) {
 		if (intel_panel_use_ssc(dev_priv)) {
 			refclk = dev_priv->vbt.lvds_ssc_freq;
@@ -1312,9 +1297,6 @@ static int i9xx_crtc_compute_clock(struct intel_atomic_state *state,
 	const struct intel_limit *limit;
 	int refclk = 96000;
 
-	memset(&crtc_state->dpll_hw_state, 0,
-	       sizeof(crtc_state->dpll_hw_state));
-
 	if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_LVDS)) {
 		if (intel_panel_use_ssc(dev_priv)) {
 			refclk = dev_priv->vbt.lvds_ssc_freq;
@@ -1351,9 +1333,6 @@ static int i8xx_crtc_compute_clock(struct intel_atomic_state *state,
 	const struct intel_limit *limit;
 	int refclk = 48000;
 
-	memset(&crtc_state->dpll_hw_state, 0,
-	       sizeof(crtc_state->dpll_hw_state));
-
 	if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_LVDS)) {
 		if (intel_panel_use_ssc(dev_priv)) {
 			refclk = dev_priv->vbt.lvds_ssc_freq;
@@ -1430,6 +1409,9 @@ int intel_dpll_crtc_compute_clock(struct intel_atomic_state *state,
 	if (!crtc_state->hw.enable)
 		return 0;
 
+	memset(&crtc_state->dpll_hw_state, 0,
+	       sizeof(crtc_state->dpll_hw_state));
+
 	return i915->dpll_funcs->crtc_compute_clock(state, crtc);
 }
 

drivers/gpu/drm/i915/display/intel_dpll_mgr.c

@@ -1068,9 +1068,6 @@ static int hsw_get_dpll(struct intel_atomic_state *state,
 		intel_atomic_get_new_crtc_state(state, crtc);
 	struct intel_shared_dpll *pll = NULL;
 
-	memset(&crtc_state->dpll_hw_state, 0,
-	       sizeof(crtc_state->dpll_hw_state));
-
 	if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_HDMI))
 		pll = hsw_ddi_wrpll_get_dpll(state, crtc);
 	else if (intel_crtc_has_dp_encoder(crtc_state))
@@ -1595,9 +1592,6 @@ static int skl_ddi_hdmi_pll_dividers(struct intel_crtc_state *crtc_state)
 		DPLL_CFGCR2_PDIV(wrpll_params.pdiv) |
 		wrpll_params.central_freq;
 
-	memset(&crtc_state->dpll_hw_state, 0,
-	       sizeof(crtc_state->dpll_hw_state));
-
 	crtc_state->dpll_hw_state.ctrl1 = ctrl1;
 	crtc_state->dpll_hw_state.cfgcr1 = cfgcr1;
 	crtc_state->dpll_hw_state.cfgcr2 = cfgcr2;
@@ -1708,9 +1702,6 @@ skl_ddi_dp_set_dpll_hw_state(struct intel_crtc_state *crtc_state)
 		break;
 	}
 
-	memset(&crtc_state->dpll_hw_state, 0,
-	       sizeof(crtc_state->dpll_hw_state));
-
 	crtc_state->dpll_hw_state.ctrl1 = ctrl1;
 
 	return 0;
@@ -2139,8 +2130,6 @@ static int bxt_ddi_set_dpll_hw_state(struct intel_crtc_state *crtc_state,
 	u32 prop_coef, int_coef, gain_ctl, targ_cnt;
 	u32 lanestagger;
 
-	memset(dpll_hw_state, 0, sizeof(*dpll_hw_state));
-
 	if (vco >= 6200000 && vco <= 6700000) {
 		prop_coef = 4;
 		int_coef = 9;
@@ -2701,8 +2690,6 @@ static void icl_calc_dpll_state(struct drm_i915_private *i915,
 {
 	u32 dco_fraction = pll_params->dco_fraction;
 
-	memset(pll_state, 0, sizeof(*pll_state));
-
 	if (ehl_combo_pll_div_frac_wa_needed(i915))
 		dco_fraction = DIV_ROUND_CLOSEST(dco_fraction, 2);
 
@@ -2820,8 +2807,6 @@ static int icl_calc_mg_pll_state(struct intel_crtc_state *crtc_state,
 	bool is_dkl = DISPLAY_VER(dev_priv) >= 12;
 	int ret;
 
-	memset(pll_state, 0, sizeof(*pll_state));
-
 	ret = icl_mg_pll_find_divisors(clock, is_dp, use_ssc, &dco_khz,
 				       pll_state, is_dkl);
 	if (ret) {